Does Excessive Coughing And Acid Reflux Cause Damage For Esophagus?

I can t stop coughing, for 6-8 weeks, I was told acid reflux after a chest xray & asthma test was said 2be normal, no fever, no body aches, no other symptons. My esophagus is beginning to hurt from coughing I have no symptons of acid reflux, no heartburn, etc. Yesterday I thought I had post nasal I don t have allergies tho I took sudafed, & my nose does seem to be clearin up, i sound nasal... & still coughing. I m afraid I m going to do damage to my lungs & or esophagus from coughing. I ve tried every otc & prescription cough med promethezaine dm. I m told by so many people here in NJ they ve had similiar just cough for weeks ....is something going around? Can i damage esophagus & lungs from coughing so hard, long? Can it be acid reflux w.no other symptons except cough? I can t take much more coughing...thanks.